Developer Tools
Format, validate, convert, and build with Monaco-powered workspaces entirely in your browser. Advanced tools for JWT, SQL, Markdown, diff, HTML/CSS, palettes, and real fetch() API requests — all client-side.
19 tools · runs in your browser
JSON Formatter
Free online JSON formatter and validator. Beautify, minify, and validate JSON instantly in your browser with line-level errors.
JSON Validator
Validate JSON online with line-level syntax errors. Free, instant, and private — runs entirely in your browser.
JSON Minifier
Minify and compress JSON to a single line in your browser. Free, fast, and private.
JSON to YAML
Convert JSON to YAML online in your browser. Free, fast, and private — no server upload.
YAML to JSON
Convert YAML configs to formatted JSON in your browser. Free, private, and instant.
JWT Decoder
Decode JWT header and payload in your browser. Fast, free, and private — no token upload.
Base64 Encoder/Decoder
Encode and decode Base64 text locally in your browser. Free, fast, and private — no upload.
JWT Generator
Generate signed JWTs with HS256/384/512 in your browser.
Cron Expression Generator
Build and explain cron schedules with next-run preview.
cURL to Fetch Converter
Convert curl commands to fetch, axios, or node-fetch code.
SQL Formatter
Format and beautify SQL with dialect and keyword options.
SQL Minifier
Minify SQL while preserving string literals.
Markdown Editor
Premium markdown editor with live preview and export.
Diff Checker
Compare text and JSON with Monaco diff view.
HTML Beautifier
Beautify or minify HTML with live preview.
CSS Minifier
Minify or beautify CSS with size stats.
Color Palette Generator
Generate accessible palettes and export to CSS or Tailwind.
API Request Builder
Send real HTTP requests from your browser with collections.
HTTP Status Codes
Search HTTP status codes with developer explanations.
Learn the concepts
Embed on your site
Add any cluster tool to your blog or docs with a lightweight iframe. Copy the snippet below.
<iframe src="https://tools.weblexia.in/embed/json-formatter?h=520" width="640" height="520" frameborder="0" loading="lazy" title="Weblexia json-formatter"></iframe>